Update JGit to 5.2.0.201812061821-r
Update JGit to 5.2.0.201812061821-r

Notable new features
- enhance UploadPack v2 protocol support
- new ssh client based on MINA sshd

Release notes
https://projects.eclipse.org/projects/technology.jgit/releases/5.2.0

Change-Id: I743691f4cc49e868b9ac6895c357d9678e027640

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